Topic
High-temperature superconductivity
About: High-temperature superconductivity is a research topic. Over the lifetime, 7263 publications have been published within this topic receiving 175377 citations. The topic is also known as: high-temperature superconductivity.
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TL;DR: In this paper, a nonoptimized design of a ferrite phase shifter that employs niobium or YBCO meanderlines has produced over 1000 degrees of differential phase shift with a figure of merit exceeding 1000 degrees/dB at X band.
Abstract: Microwave devices comprising magnetized ferrite in contact with superconductor circuits designed to eliminate magnetic field penetration of the superconductor have demonstrated phase shift without significant conduction losses. The device structures are adaptable to low- or high-T/sub c/ superconductors. A nonoptimized design of a ferrite phase shifter that employs niobium or YBCO meanderlines has produced over 1000 degrees of differential phase shift with a figure of merit exceeding 1000 degrees/dB at X band. By combining superconductor meanderline sections with alternating T junctions on a ferrite substrate in a configuration with three-fold symmetry, a low-loss three-port switching circulator has been demonstrated.
68 citations
Book•
01 Jan 1994
TL;DR: In this article, heavy-fermion magnetism and superconductivity of high-temperature superconductors are discussed. And the normal state of the High Temperature Superconductors is discussed.
Abstract: Heavy Fermion Insulators (J. Robert Schrieffer) Heavy Fermion Magnetism and Superconductivity (E. Abrahams) The Metal-Insulator Transition (S. Trugman) The Superconductor-Insulator Transitions (K. Bedell) Lattice Effects in High-Temperature Superconductors (D. Pines) Spin Fluctations and High-Temperature Superconductors (J. Wilkins) The Normal State of the High Temperature Superconductors.
68 citations
TL;DR: By measuring the dynamic and traditional magnetization relaxations, Wang et al. as discussed by the authors investigated the vortex dynamics of the recently discovered superconductor SmFeAsO(0.9)F (0.1) with T(c) = 55 K and found that the relaxation rate is rather large reflecting a small characteristic pinning energy.
Abstract: By measuring the dynamic and traditional magnetization relaxations we investigate the vortex dynamics of the recently discovered superconductor SmFeAsO(0.9)F(0.1) with T(c) = 55 K. It is found that the relaxation rate is rather large reflecting a small characteristic pinning energy. Moreover it shows a weak temperature dependence in wide temperature region, which resembles the behavior of the cuprate superconductors. Combined with the resistivity data under different magnetic fields, a vortex phase diagram is obtained. Our results strongly suggest that the model of collective vortex pinning applies to this superconductor very well.
68 citations
TL;DR: Core-level spectroscopic measurements of several cuprate perovskites comparing those which exhibit superconductivity above 90 K to others which do not show that in the former Cu is more oxidized, as in CuO (nominally CuO 2+), than in the latter.
Abstract: We report core-level spectroscopic measurements of several cuprate perovskites comparing those which exhibit superconductivity above 90 K to others which do not Both x-ray photoemission and x-ray absorption results show that in the former Cu is more oxidized, as in CuO (nominally ${\mathrm{Cu}}^{2+}$), than in the latter Trivalent Cu is clearly excluded The O $1s$ core level is at higher binding energy in the superconductors, implying the presence of O $2p$ holes The rare-earth valence in Ce- and Pr-based perovskites is more than 3+, apparently related to their failure to superconduct
68 citations
TL;DR: In this paper, a doubly degenerate Hubbard model was used to describe the hole of the La 2CuO 4 type and the degeneracy was lifted due to an orbital superlattice which distorts the crystal and creates an antiferromagnetic interaction between the holes.
68 citations